Question: Is there a standard key in which car horns honk? And if there is, what is it? I was coming home from a college visit with my mom earlier today, we were driving down the highway and suddenly I heard this sound that sounded like the opening chords to a song. It turned out to just be a car honking twice at someone, but it gave me an idea for a cool intro to a song. I don't know what kind of car it was, I didn't see it, and I suppose it's a bit of a long shot to try and figure out which key the honking was in...but might as well try.